Loom take-up let-back mechanism



April 1952 H- B. GOSNELL 2,591,538

LOOM TAKE-UP LET-BACK MECHANISM Filed Oct. 24, 1950 2 SLEETS SI IEET lPwoTEo TO ELEMENT LowEREo WHEN RAISED WHEN LOOM LOOM IS STOPPED lsSTOPPED TO DEPRESS LEvER AND APPLY BRAKE z ROOKED BY usu l- MEANS m mmmm LAY April 1952 H. B. GOSNELL 2,591,538

LOOM TAKE-UP LET-BACK MECHANISM Filed Oct. 24, 1950 2 SHEETS-SHEET 2Iawenoa Hard; BBosnelZ,

fliioa neys Patented Apr. 1, 1952 UNITED STATES EN T OFFICE 6 Claims.

This invention relates to the take-up mechanism ofa loom and hasparticularly for its object to prevent and eliminate set marks caused bya portion or section of the warps becoming permanently stretched, acondition which is usually caused when the loom is stopped and isinoperative for a period of. time.

The object of the invention is to provide for an efiectively controlledlet-back of the take-up roll whenever the loom is either automaticallyor manually stopped.

Thelet-back mechanisms heretofore provided forthetake-up roll of a loomare commonly operated by a ratchet toothed or pick-wheel advanced by apawl operated from a moving part of the loom and held against let-backby a holding or detent pawl. Another object of the invention is toprovide novel means acting when the loom is stopped to release theactuating pawl of the pick-wheel. And another object of the invention isto provide novel means for controlling. to any required extent theamount of let-back when both the actuating and the detent pawls arereleased from the pick-wheel.

The invention not only eliminates the occurrence of set marks, due tostretching a section" of the warps when the loom is stopped and remainsinoperative for a period of time, but it alsomay be employed to preventthe occurrence of thin places in the weaving which may occur when theloom is momentarily stopped for any reason.

The object of the invention is further to pro videv a mechanism whichmay be readily reset by the operator with a. minimum of mechanicaleffort and which is readily accessible to the normal working position ofthe weaver.

The nature and objects of the invention will appear more fully from theaccompanying description and drawings and will be particularly pointedout in theclaims.

Since the invention is applicable to and. readily embodied in a widevariety of looms, and since the construction and. operation of thosefeatures of looms which are in any way connected with a mechanism of thepresent invention, are well known and familiar to those skilled. in theart, it is only necessary to a disclosure ofa preferred form of thepresent invention to illustrate but a small portion of an ordinary typeof loom.

In the drawings:

Fig. 1 is an end elevationof a portion. of a loom adjacent the take-uproll with a construction embodying a preferred form of the inventionembodied therein; 7

with the elements in.adifferent position.

A. portion of the. side frame I- of a loom is shown with one of the layswords 2 and the lay 3.

An ordinary form. of take-up roll 4 is shown mounted in a usual positionat the front of the loom and journaled at its end5 in the side frames.This take-up rollis driven from a ratchet toothed pick-wheel 6 mountedtogether with a handwheel i on a shaft Bjournaled inthe. side frame I.

The principles of the present invention are. applicable to the differentforms of take-up mechanism. In. the particular type illustrated thecloth 9 passes down at. the front of theloom directly onto and. iswoundupon. the take-uproll. 4, and the take-up r0114 is driven-from thepick-wheel by a train of gearing connecting the p'ick wheel shaft 8 tothe take-up roll. Thus the take-up roll. isshown. provided with a largegear Ill,v the shaft-.18. witha pinion H,, andastub shaft. on the sideframe I with api'nion i2 intermeshingwith the pinion Band. the gear l0;Thus as the pickwheel is. rotated counterclockwise the takesup rollwilllbe rotated counterclockwise to wind'the cloth thereon asillustrated;

The advancing. or. take-upv movement ofthe pick-wheel is illustrated asefiected by a pawl 13 having a-tail' ['4 andful'crumed at l5 upon acarrier lever l6 f'ulcrumed. on the shaft 8. The pawllcarri'er lever 6,like any of the well' know'n pawl-actuating levers employed foradvancing the pick-wheel'of a take-up mechanism, maybe rocked by any ofthe usual'me'ans. in time with the lay, as indicated on the drawings.

The hold-back or detent pawl IT for the pick-. wheel is. shown of ausual construction having an upwardly projecting handle l8 and pivotallysupported; in this 'case, on the shaft I91 secured in the loom sideframe.

In. the preferred: form of the invention illustrated' the means forreleasing, the pawl I3'from the pick-wheel when the loom isstoppedisconveniently associated-with the usual lever, the forward end of whichis shown at20, for ap plying the brake to a loom. Such a brake-applyinglever'is usually provided with a connection 2! which is lowered, as fromthe-usual shipper handle, whenever the loom isstopped,v either.

automatically or manually to depress thelever and apply-the loom brake.The pawl, asnoted,v is provided with a tail. [4. A. bracket 221s. ad.-justably mounted on the forward end of the retractable from its positionabove the pawl tail and means are provided for looking it in retractedposition. Thus the plunger 23 is "pro vided at its outer end with ahandle 24 and at the inner portion with a washer 25. A spring 28interposed between the washer 25 and the bracket 22 tends to project theplunger into position over the pawl tail. A pin 21 secured tothe plungerrides in a slot in the bracket and when the plunger is retracted to theposition shown in dotted lines it is turned to bring this pin againstthe end of the frame 22 and thus hold the plungerjin retracted position.

The means illustrated'for releasingth e holdback or detent (I from thepick-wheel, whenever lthe loom is stopped, is illustrated as of afamiliar type in which a link 28 is provided at its lower end with 'a'slot 29 engaging'a pin projecting from the pawl and at its upper end ispivoted to an element raised in the usual manner, as from the shipperhandle, when'the loom is stopped either automatically or manually. r' JThe invention, as noted, provides extremely accurately adjustable meansfor oontrolling'the amount of let-back of the pick-wheel when the loomis stopped and consequently the amount of relaxation of the tension onthe warps. For this purpose the invention provides an indicator whichisyieldingly heldin 'a radial direction against the teeth of thepick-wheel so that as the pick-wheel advances the teeth ride beneath,and in frictional engagement with, the indicator, but when thepick-wheel turns in the opposite. direction the indicator is movedtherewith and is thus retractedby its engagement with a tooth of thepick-wheel. In the construction shown the indicator is-inithe form of asmall plate 40 mounted to slide at its ends onflthe arms of a wire.loopr ll. The arms Al of this loop are conveniently,at their lowerends, wound about the shaft 8 or the hub of the pickwheelso, as to bepivoted thereon. 1 Coiled springs '42 on the upper end of the arms 4]act to press the indicator in a substantially radial direction.againstthe teeth of the pickwhe'eL: As the pick-wheel is advanced inthenormal operation of the loom the indicator is held against advancingmovement by the engagement of the supporting loop with the hub of thedetent pawl H, asfshown in full lines, (Fig. l) and thus the advance ofthe indicator by-its frictional. engagement with the pick-wheel islimited by this hub acting as a forward stop. Whengthe pawls arereleased from the pickwheel and the pick-wheel lets back or reverses itsrotationmovingclockwise, the indicator by its engagement with a tooth ofthe pick-wheel partakes of this samemovemen't and the extent of thismovementfis accurately controlled and limited by the indicator cominginto engagement with a rearward stop 43. This rearward stop, in'thepreferred form illustrated, has

an arm 44 projecting past the pick-wheel and is adjustably mounted uponan arcuate guide 45 in turn mounted in fixed position adjacent andconcentric the pick-wheel. In Fig. 1 the indicator is shown in dottedlines in one retracted position in engagement with the rearward stop 43.

Thus by adjusting the rearward stop along the arcuate guide the let-backmovement of the pick-wheeland consequently of the take-up roll may beaccurately controlled so as to relax the tension on the warp to anydesired degree.

When the loom is restarted and the pawls restored to engagement with thepick-wheel the indicator 4!] is carried by frictional engagement withthe teeth of the ratchet wheel from its position against the rearwardstop 43 to its forward position against the forward stop and thus is inoperative position for the occurrence of a subsequent stoppage of theloom.

It will thus-be seen that whenever the loom is stopped, eitherautomatically or manually, both pawls are released from the pick-wheeland the exactamount of'let-back of the take-up roll and release of warptension is determined by the position of the rearward stop so that it isunder accurate control by the weaver. Moreover, the parts are sopositioned that the weaver standing in his normal position at the sideof the loom may readily make the required adjustment. Moreover, bothpawls are readily accessible so that either may be released and restoredto the pickwheel whenever desired. In the case of the pawl 13 it will benoted that the arm 23 on the brakeapplying lever will norm-ally standabove the tail l4 and that the detent pawl I! may be swung by means ofthe handle i8 out of engagement with the pick-wheel and with its stud 30riding in the slot 29.

Having thus described the invention, what is claimed as new," anddesired to be secured by Letters Patent, is: 1. In a loom take-up rollmechanism in which a ratchet toothed pick-wheel is connected to thetake-up roll, in which the pick-wheel and therewith the take-up roll isadvanced by a pawl operated from a moving part of the loom, and in whichthe pick-wheel and therewith the takeup roll is held against let-back bya detent pawl, the combination of means for controlling letback when thepawls are released from the pickwheel consisting of an indicatorjournaled on the pick -wheel axis and yieldingly held radially againstthe pick-wheel teeth, a forward stop limiting the'advance oftheindicator by its frictional engagement with the pick-wheel, and arearward stop limiting the retraction of the indicator by its engagementwith a tooth of the pick-wheel.

2. The camhination' in a, loom take-up roll mechanism as defined inclaim1, together with anarcuate guide mounted ingfixed position adjacent andconcentric the pick-wheel, and means for'adjustably mounting therearwardstop on saidguida'jf 3. In a loom take-uproll mechanism in whicha ratchet toothed pick-wheel is connected to the take-up roll, in whichthe pick-wheel .and therewith the take-up roll is advancedby ap'awlhaving a tail and fulcrumed' upon a carrierlever operated from a movingpart of theloomfin which the pick-wheel and therewith the take-up rollis held against let-back by a'detent pawl, and in which when the loom isstopped a leveris depressed to apply a brake, the combinationbf abracket on the brake-applying lever, an arm extending from the bracketabove the pawl tail and v acting upon depression of the brake-applyinglever to rock the pawl out of engagement with T the pick-wheel.

4. The combination in a loom take-up.;. 'ol1 of the first pawl out ofengagement with the pick-wheel.

5. The combination in a loom take-up roll mechanism as defined in claim3, together with means acting to release the detent pawl from thepick-wheel simultaneously with the rocking of the first pawl out ofengagement with the pickwheel, and means for: controlling the amount oflet-back upon the release of both pawls from the pick-wheel.

6. The combination in a loom take-up roll mechanism as defined in claim3, in which the said arm extending from the bracket consists of aplunger retractable from a position above the pawl tail and means forlocking the plunger in retracted position.

HARDY B. GOSNELL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 137,188 Estes Mar. 25, 1873FOREIGN PATENTS Number Country Date 22,277 Great Britain of 1911 121,895Great Britain Jan. 9, 1919 319,846 Great Britain Oct. 3, 1929

